ublic health officials worldwide are struggling to manage the lethal coronavirus disease 2019 (COVID-19) pandemic. As part of the response, governments, technology companies, and research organizations are leveraging emerging datacollection and data-analysis capabilities to understand the disease and model and track its spread through communities. Facilitated by a trove of technology-based data sourcesin particular, the data generated from the widespread use of mobile phones-these public health surveillance programs could prove especially valuable for preventing successive waves of infections as quarantine orders are relaxed and economies reopen.

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